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        Can the inverter save power? Does the inverter save power for the motor?

        2023-05-20 11:25:36

        Whether the inverter can save power is a vague question. If the frequency is not changed and the frequency is running at 50HZ, the motor controlled by the inverter is not energy-saving. As long as the frequency is changed and the frequency is below 50HZ, there is no doubt that the motor controlled by the inverter is It is energy-saving. In industrial power, inverters are used to control most of the motors, such as cooling fans. The air volume needs to be adjusted. If the inverter is not used to control the fan motor, the contactor is used to control the fan motor. Pressure operation, the air volume is completed by the damper regulator, the motor power is greater, the power consumption is greater, if you use a frequency converter to control the fan motor, then the damper regulator is not required, as long as the size of the air volume is adjusted by the inverter Frequency to complete, if a small amount of air is required, it is sufficient to adjust the frequency to about 30HZ, so will not save energy?

        For electric motors that cannot be fully loaded, the frequency reduction effect is not obvious without frequent starting. For example, constant pressure water supply is a good example of application. It is better for air conditioning. When it is turned on, it will be operated by frequency control to increase frequency and cool faster. When the cooling demand is not large, low-speed operation is maintained. Room temperature is more comfortable, and it wo n’t stop for a while to cause the room temperature to fluctuate. In short, it can save electricity more reasonably.

        I remember that more than 20 years ago, the inverter was hyped as a power-saving device to sell. At that time, the price was too expensive. Many users installed it. As a result, the inverter was damaged and the electricity bill was not collected. The main function of the inverter is to regulate the speed, and the energy is conserved. People who know physics in junior high school know this common sense. In some occasions, installing an inverter can save electricity. In the past, changing fans, injection molding machines, water pumps and air conditioning systems were very popular. It is because in some time periods, the motor speed can be reduced without affecting the operation of the equipment, or the motor size is selected to be large.


        The inverter has been described as a power-saving and energy-saving control product in many materials or literatures, which has led people to the concept of energy-saving and energy-saving of the inverter itself, but this is actually a misunderstanding. Whether it can achieve the effect of power saving and energy saving depends on the specific conditions used.

        In fact, whether the power can be saved depends on the operating conditions of the equipment. If you are running at full load, with or without frequency conversion is the same.

        The reason why the frequency converter can achieve power saving and energy saving in most cases is because the frequency converter governs the speed control of the motor, but in fact, most speed regulation equipment can achieve this effect. Therefore, it is obvious that we cannot consider the inverter as an energy-saving product.

        The premise of the inverter to save power is the speed regulation characteristic of its load. For those spare parts that have a large impact on the power, such as centrifugal fans and centrifugal pumps, the inverter's adjustment effect is significantly better than its own speed adjustment operation. Under the premise of this, the inverter can actually achieve the effect of energy saving.


        If the spare parts handled by the inverter are constant torque loads or even constant power loads, then when the speed is reduced, the power decline is not obvious or the power remains constant, so the use of the frequency converter cannot reach the same Energy-saving and power-saving effects, and even can't save electricity at all.

        In order to save energy, the inverter must reduce the frequency. The larger the drop value, the more power is saved. Without reducing the frequency, the inverter cannot save power in principle. There are certain conditions for the inverter to save power. Under the conditions that do not affect the use, after appropriately changing the working condition parameters, the power consumed by unreasonable operating parameters can be saved, and the normal operation can be transformed into economic operation.

        1. It is related to the motor load factor. When the load rate is 10% to 90%, the power saving rate is about 8% to 10% at most, and the lower the load rate is, the higher the power saving rate is. However, the reactive power saving rate is about 40% to 50%, which does not include electricity bills.

        2. It is related to the reasonableness of the original operating condition parameter value. For example, it is related to adjustable magnitudes such as pressure, flow rate, and rotational speed. If the adjustable amount is large, the power saving rate is high, otherwise the opposite is true.

        3. It is related to the original adjustment method. It is uneconomical to adjust the operating parameters by means of an inlet or outlet valve. If it is changed to a frequency converter, it is economical and reasonable. After using the frequency converter to adjust the speed, it can save 20% to 30% more electricity than adjusting the operating method with an artificial valve.

        4. It is related to the original speed regulation method. For example, the original use of slip motor speed control, because of low speed efficiency, especially at low and medium speeds, the efficiency is only less than 50%, which is not economical. After changing to inverter speed control, this part of energy was saved. At present, in light industry, textile, papermaking, printing and dyeing, plastics, rubber and other industries, most of them still use slip motors, so the use of frequency converters to achieve energy saving, technical transformation is an urgent matter.

        5, related to the working mode of the motor. For example, the power savings of continuous operation, short-term operation, and intermittent operation are different.

        6, related to the length of time the motor starts. For example, if you turn on the machine for 24 hours a day, it will save 365 days a year to save power.

        7. It is related to the power of the motor itself. Under the same power saving rate, a large power saving value will have a large economic benefit, even if the power saving rate is lower than that of a small power motor, the actual benefit will be greater.

        8. It is related to the importance of the production process design of the unit. First of all, it is necessary to choose a product with high power consumption, high product cost, and the current speed regulation method is not economical and reasonable. Each of them should be transformed. After the inverter is used, it will have an immediate effect and do more with less.


        Since its establishment in 1998, Shenzhen ambition Electronics Co., Ltd. has grown into an internationally renowned professional inverter manufacturer after 21 years of rapid and steady development.

        The company has industry-leading independent core technology and sustainable research and development capabilities, and provides high-quality products such as general-purpose inverters.


        As the inverter can achieve high efficiency, save energy, improve process and other advantages in many industries, ambition inverters have been widely used in fans, water pumps, injection molding machines, winding machines, chemical, metallurgy, mining, plastics, printing And other types of machinery and equipment.


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